kennknowles opened a new pull request, #39908:
URL: https://github.com/apache/beam/pull/39908
Beam SQL named each composite it expands a query into after the relational
node class and a JVM-global counter, e.g. BeamCalcRel_57. That counter was
global, so the same query produced different names on different runs, and the
names said nothing about what the stage does.
Name a stage after the operations fused into it instead, e.g.
Filter;Project. The provenance label rides along as a RelHint so that it
survives copy() and the conversion to physical rels, and is composed as a
canonical union of the labels of the nodes a rule matched -- order independent,
so transpose rules trading a pair back and forth cannot hand the planner an
endless supply of rels it has not seen.
Since Dataflow matches streaming pipelines for update by step name, the
experiment legacy-sql-transform-names restores the old naming for pipelines
that need to be updated across this change.
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